TH8401 Programmable DC Electronic Load

TH8400系列是一款高精度、高智能、易操作的直流电子负载。该系列仪器集合了多种测试功能，性能优越，并且采用液晶屏显示，显示明了，操作菜单化，快捷方便，能很好的适应生产现场快速操作需要以及实验室高精确度高稳定度的需要。

TH8400系列可编程直流电子负载包括以下几种类型：

Functional Features

Conventional mode (4 types)

CC 恒定电流模式

An electronic load always draws a constant current, regardless of whether the voltage changes.

CR 恒定电阻模式

An electronic load is equivalent to a constant resistance, and the load changes current linearly with voltage.

CV 恒定电压模式

The electronic load controls the voltage output from the power supply by adjusting the pull current according to the set voltage value.

CP 恒定功率模式

An electronic load is equivalent to a constant resistance, and the load changes current linearly with voltage.

Advanced modes (12)

DYN 动态负载模式

高达25kHz的动态测试频率可用来测试电源带宽范围内的动态特性，可设置两个电流位准，两个电流位准分别持续的时间，上升斜率，下降斜率，重复次数。此功能可用于测试D/D转换器与电池的瞬间大电流耐受程度。

SWP 动态频率扫描模式

电子负载提供一种可编程的动态频率扫描，以变频找出最坏情况的待测物电压。动态频率扫描需要设置两个电流位准，起始频率，终止频率，步阶频率，持续时间，上升斜率，下降斜率。操作时，电子负载会在设定的持续时间内，以设定的频率拉载电流。频率最高可达25kHz，用以捕捉被测电源最恶劣情况下的Vp+、Vp-以及相应的Fp+、Fp-。

CR-LED 模拟LED测试模式

By setting the on-state voltage and resistance of the light-emitting diode, it can realistically simulate the actual load characteristics of the LED, avoiding the oscillations generated by the unstable voltage and current under the conventional constant resistance mode (CR), and thus detecting the real load conditions of the LED power supply.

BATT 电池测试模式

Load test battery performance, discharge conditions support CC, CR and CP three ways, by setting voltage, time, current capacity or power capacity of four conditions to let the electronic load to stop pulling load, to ensure that the battery will not be over-discharged and damaged.

Load Effect Test

The load will be carried under low quasi-pull current (Imin), high quasi-pull current (Imax) and normal operating current (Inormal) for a preset period of time (Delay), and then the voltage values under different loads will be recorded to measure and display the Load Adjustment Ratio (Regulation), ΔV, and Power Supply Internal Resistance (Rs) of the power supply under test.

TIME 时间量测模式

在 0s至100000s范围内测量触发条件开始到触发条件截止的时间。可应用于电池的充、放电试验等类似应用。

OVPT 过电压保护测试模式

负载捕捉输入电压峰值点及下降沿，并在下降沿时刻的预设电平(Vtrig)处触发，则此电压峰值便是被测电源的过压保护点，而峰值时刻到触发时刻的时间间隔，便是被测电源的 OVP 响应时间（Tovp），Tovp 量测精度 2us。

OCPT 过电流保护测试模式

The electronic load pulls a step-up current to test whether the output voltage of the power supply is lower than the trigger voltage under overload conditions, and then determine whether the output protection function of the power supply is normal.

OPPT 过功率保护测试模式

The electronic load pulls the load step-up power to test whether the output voltage of the power supply is lower than the trigger voltage under overload conditions, and then determine whether the output protection function of the power supply is normal.

LIST 列表测试模式

LIST 模式可以准确高速的完成复杂的任意电流变化模式，完成多准位电流带载的精密测试。通过编辑每一步的拉载值、持续时间、斜率和重复次数，生成多种复杂序列，满足复杂的测试需求。

It is mainly applied to simulate battery discharge pull current, laptop pull current, electric vehicle pull current, and dynamic current above two current levels.

AUTO 自动测试模式

AUTO 模式可以准确的模拟生产线的自动测试流程，完成多步骤的精密测试，可以帮客户大大的节约成本。每一个步骤都可以设定不同的模式，通过编辑每一步的拉载值、持续时间、上升斜率、下降斜率以及电流电压功率的上下限，可以判断每一步是否合格。

B. Programmable rate of change of loading current

The user can set the rate of change during current loading according to the application. If the rate is set, the rate will take effect in the following cases.

◎ When changing the set value to change the current value (including various advanced functions).

◎ When there is a change due to the loading current value.

C. Programmable soft start function

The soft start function can be used to set the rise time of the load current. The start-up time is continuously adjustable between 10μs and 500ms.

This function can be used to prevent the output of the DUT from becoming unstable due to a sharp rise in load current, or to avoid a delayed start of the power supply due to overcurrent protection.

D.短路功能

Independent short-circuit test function supports short-circuit test in any function mode, realizing seamless connection with other functions. When the instrument enters the short-circuit test, the instrument is loaded at the maximum current of the current range.